Musical notes, like all sounds, are a result of the sound waves created by movement, like the rush of air through a trum

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Musical notes, like all sounds, are a result of the sound waves created by movement, like the rush of air through a trumpet. Musical notes are very regular sound waves. The qualities of these waves ג€" how much they displace molecules, and how often they do so ג€" give the note its particular sound. How much a sound wave displaces molecules affects the volume of the note. How frequently a sound wave reaches your ear determines whether the note is high or low pitched. When scientists describe how high or low a sound is, they use a numerical measurement of its frequency, such as ג€440 vibrations per second,ג€ rather than the letters musicians use.In this passage, musical notes are used primarily to:

A. illustrate the difference between human-produced and non-human-produced sound.
B. demonstrate the difference between musical sound and all other sound.
C. provide an example of sound properties common to all sound.
D. convey the difference between musical pitch and frequency pitch. E. explain the connection between number and letter names for sounds